AIX 6.1 TL Upgrade using multibos

In this post I will describe a TL upgrade using multibos on AIX 6.1. The system will be moved from 6100-04 to 6100-07 (TL4 to TL7).

1. Create a separate filesystem for the updates 2. Create a backup of the system 3. Check current TL level 4. Preview/Create the multibos standby BOS instance. 5. Preview/Patch the OS in the standby instance 6. Verify the oslevel in the standby instance after the update 7. Reboot and check 8. Optionally return to the pre-update BOS image.1. Create a separate FileSystem for the /usr/sys/inst.images folder

In order to fix this issue with multibos it is nacessary to apply the APAR fixes on the live system (not the standby BOS instance). Afterwards verify if the APAR fixes have been applied. A system reboot will be required after the APAR fixes have been installed.

# oslevel -s
6100-07-01-1141
# instfix -i | grep ML
All filesets for 6100-00_AIX_ML were found.
All filesets for 6100-01_AIX_ML were found.
All filesets for 6100-02_AIX_ML were found.
All filesets for 6100-03_AIX_ML were found.
All filesets for 6100-04_AIX_ML were found.
All filesets for 6100-05_AIX_ML were found.
All filesets for 6100-06_AIX_ML were found.
All filesets for 6100-07_AIX_ML were found.
.

8. Optionally return to the pre-update BOS image.

If necessary you can return to the initial TL, just change the boot order.